chore: improved cli

cmd/nfpm/main.go

@@ -13,28 +13,58 @@ import (
 )
 
 var (
-	app    = kingpin.New("pkg", "packages apps")
-	config = app.Flag("config", "config file").ExistingFile()
-	format = app.Flag("format", "format to package").Default("deb").String()
-	target = app.Flag("target", "where to save the package").Required().String()
+	app    = kingpin.New("nfpm", "not-fpm packages apps in some formats")
+	config = app.Flag("config", "config file").Default("nfpm.yaml").String()
+
+	pkgCmd = app.Command("pkg", "package based on the config file")
+	format = pkgCmd.Flag("format", "format to package").Default("deb").String()
+	target = pkgCmd.Flag("target", "where to save the package").Required().String()
+
+	initCmd = app.Command("init", "create an empty config file")
 )
 
 func main() {
-	kingpin.MustParse(app.Parse(os.Args[1:]))
+	switch kingpin.MustParse(app.Parse(os.Args[1:])) {
+	case initCmd.FullCommand():
+		if err := initFile(*config); err != nil {
+			kingpin.Fatalf(err.Error())
+		}
+		fmt.Printf("created empty config file at %s, edit at will\n", *config)
+	case pkgCmd.FullCommand():
+		if err := doPackage(*config, *format, *target); err != nil {
+			kingpin.Fatalf(err.Error())
+		}
+	}
+}
 
-	bts, err := ioutil.ReadFile(*config)
-	kingpin.FatalIfError(err, "")
-
-	var info nfpm.Info
-	kingpin.FatalIfError(yaml.Unmarshal(bts, &info), "%v")
-
-	pkg, err := nfpm.Get(*format)
+func initFile(config string) error {
+	yml, err := yaml.Marshal(nfpm.Info{})
 	if err != nil {
-		kingpin.Fatalf(err.Error())
+		return err
+	}
+	return ioutil.WriteFile(config, yml, 0666)
+}
+
+func doPackage(config, format, target string) error {
+	bts, err := ioutil.ReadFile(config)
+	if err != nil {
+		return err
 	}
 
-	f, err := os.Create(*target)
-	kingpin.FatalIfError(err, "")
-	kingpin.FatalIfError(pkg.Package(info, f), "")
-	fmt.Println("done:", *target)
+	var info nfpm.Info
+	err = yaml.Unmarshal(bts, &info)
+	if err != nil {
+		return err
+	}
+
+	pkg, err := nfpm.Get(format)
+	if err != nil {
+		return err
+	}
+
+	f, err := os.Create(target)
+	if err != nil {
+		return err
+	}
+	return pkg.Package(info, f)
 }

nfpm.go

@@ -36,24 +36,24 @@ type Packager interface {
 
 // Info contains information about the package
 type Info struct {
-	Name        string            `yaml:"name,omitempty"`
-	Arch        string            `yaml:"arch,omitempty"`
-	Platform    string            `yaml:"platform,omitempty"`
-	Version     string            `yaml:"version,omitempty"`
-	Section     string            `yaml:"section,omitempty"`
-	Priority    string            `yaml:"priority,omitempty"`
-	Replaces    []string          `yaml:"replaces,omitempty"`
-	Provides    []string          `yaml:"provides,omitempty"`
-	Depends     []string          `yaml:"depends,omitempty"`
-	Conflicts   []string          `yaml:"conflicts,omitempty"`
-	Maintainer  string            `yaml:"maintainer,omitempty"`
-	Description string            `yaml:"description,omitempty"`
-	Vendor      string            `yaml:"vendor,omitempty"`
-	Homepage    string            `yaml:"homepage,omitempty"`
-	License     string            `yaml:"license,omitempty"`
-	Bindir      string            `yaml:"bindir,omitempty"`
-	Files       map[string]string `yaml:"files,omitempty"`
-	ConfigFiles map[string]string `yaml:"config_files,omitempty"`
+	Name        string            `yaml:"name"`
+	Arch        string            `yaml:"arch"`
+	Platform    string            `yaml:"platform"`
+	Version     string            `yaml:"version"`
+	Section     string            `yaml:"section"`
+	Priority    string            `yaml:"priority"`
+	Replaces    []string          `yaml:"replaces"`
+	Provides    []string          `yaml:"provides"`
+	Depends     []string          `yaml:"depends"`
+	Conflicts   []string          `yaml:"conflicts"`
+	Maintainer  string            `yaml:"maintainer"`
+	Description string            `yaml:"description"`
+	Vendor      string            `yaml:"vendor"`
+	Homepage    string            `yaml:"homepage"`
+	License     string            `yaml:"license"`
+	Bindir      string            `yaml:"bindir"`
+	Files       map[string]string `yaml:"files"`
+	ConfigFiles map[string]string `yaml:"config_files"`
 }
 
 // WithDefaults set some sane defaults into the given Info